1

Whiplash:
Healing is directly proportional to the energy absorbed during the injury. So, harder impact=longer healing time. Generally speaking, this is purely a muscular problem and worsens for a day or two, and then improves thereafter over days or weeks. Rarely does whiplash produce lasting symptoms over 2-3 months (unless a lawsuit is involved, then all bets are off).
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Neck pain can be a symptom of many problems, infections, growths, cervical disk disease, fractures, vascular problems (some serious), heart issues, etc., etc. See your doctor for an exam and possible referral to a specialist.
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2

Neck trauma :
Remove it, hard collar should be removed as soon as it is determined that you do not have ligamentous instability, disc herniation, or fracture. If there's no plan for surgery then no hard collar. You should be started on physical therapy. early physical therapy and range of motion will improve range of motion and your overall outcome and speed the recovery.
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4

Depends on patient:
Multi-cervical unit (mcu) can help some patients. It would be best that you are evaluated by a physician who can determine if you would be candidate for this type of treatment.
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6

Whiplash pain:
Have you experienced whiplash before? Stiffness, aching, altered range of motion, and headache can be experienced after whiplash injury. These symptoms need to be treated as soon after injury as possible, to prevent muscle shortening, and control pain. Physical, therapy or chiropractic with myofascial release can be most helpful, and x rays with flexion and extension will help determine causes.
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8

Usually not:
If you have not broken your neck (xray or CT was clear) , then the usual course of a neck sprain after an accident is initial pain that worsens for 1-3 days, then gradual resolution over 2-3 weeks. A neck collar worn correctly is uncomfortable, and that discomfort may worsen over time. If you have a disk problem that causes pain radiating to the arms, that appears right away, not after wks
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9

Yes:
Prior injury in the neck can cause you to have tension-headaches for quite a while afterward. Treatment consists of anti-inflammatory medications (but not in excess or this will worsen the headaches), and stretching/physical therapy for the neck injury. If it has been going on for a while see your doctor.
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Whiplash is a term for injuries to the neck due to sudden neck movements common in motor vehicle accidents. These injuries can cause pain or, if the spinal cord is damaged, weakness or lack of sensation.
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